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Hi,
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Please check that they have any LED blinking. If it not blinking it is hardware issue. need to contact local tech. if it blinking. Reboot the computer and taping F10 button while you rebooting the computer and run system recovery and follow by the steps.

I have 3 of these laptop Pcg-61611l and all 3 are black screen on start up. Sony has a problem with this and is not saying any thing about it.
What I do is turn on laptop let the green power bottom stay on ,walk away for 10 to 15 minutes then shut it down and restart you should see the three green lights by the power bottom flash twice and then your working again . Laptop will work fine until you turn it off. Repeat to power back up.

Screen bulb burning out, bad inverter, or LCD wires crimped or exposed and touching each other and shorting out. Have IT open this puppy up and look into it or you can do it if you got the tools and your handy.
You can get a new screen on e-bay for around $150

Hi there.Take the battery out and try to boot on AC power only, if it boots up, turn it back off and reinsert the battery and try to boot again.If it still suffers from the same symptoms please post back for more advice.

It is definitely the screen or the inverter. Usually the screen and inverter come as one piece. I would check with the manufacturer. Unfortunately for you, the LCD is one of the most expensive parts to replace on a laptop.

Just the simple fact of you mentioning that it works fine with an external monitor tells me that its not the video card. If it was the video card, you would see the exact same thing happening on your external monitor as well.